Proxy/VPN for firefox. What do you advise?

Question

proxy

Switched to Linux, and, accordingly, to Firefox (dev version). Interested in a good VPN / proxy, with a decent speed. Security / anonymity is not a priority, you just need to go to some blocked sites. It is desirable with the ability to connect for individual sites / tabs, and not the entire browser.
PS: free options are preferred.

Answer 1

antizapret.prostovpn.org/proxy.pac